"ngữ âm học" meaning in Vietnamese

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      "expansion": "ngữ âm học",
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  "lang": "Vietnamese",
  "lang_code": "vi",
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      "id": "en-ngữ_âm_học-vi-noun-AoAOTXzq",
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          "phonetics",
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        "(linguistics) phonetics"
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      "related": [
        {
          "word": "âm tố"
        }
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        "human-sciences",
        "linguistics",
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      "ipa": "[ŋɨ˦ˀ˥ ʔəm˧˧ hawk͡p̚˧˨ʔ]",
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        "Hà-Nội"
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    {
      "ipa": "[ŋɨ˧˨ ʔəm˧˧ hawk͡p̚˨˩ʔ]",
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        "Huế"
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    {
      "ipa": "[ŋɨ˨˩˦ ʔəm˧˧ hawk͡p̚˨˩˨]",
      "note": "Saigon"
    }
  ],
  "word": "ngữ âm học"
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    {
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        "head": "ngữ âm học"
      },
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      "ipa": "[ŋɨ˧˨ ʔəm˧˧ hawk͡p̚˨˩ʔ]",
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      "ipa": "[ŋɨ˨˩˦ ʔəm˧˧ hawk͡p̚˨˩˨]",
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}